Or it could just fly upside down. maybe add wheels to set cutting height :)
The scene from Spies Like Us always comes to mind when bouncing lasers around. Or the Real Genius as well. So you better be careful using this around corn fields, or we know what can happen.
I love the image of this in my head, but I can imagine in practice that many farms are not on flat terrain where there's direct line of sight [fire] for a central station to flash a lazer pulse. Perhaps if you had many smaller stations with these laser cannons spread about the field and each cannon would coordinate with the drone in the closest line of sight.
Pretty sure they're explicitly suggesting indirect fire, actually. Base station fires at mirror, and drone uses mirror to reflect laser to target. There might be stability problems, angle-at-which-it-hits-the-weed problems, and more-laser-scattering-due-to-longer-beam-path problems, but line of sight itself should be fine since the drone is up in the air.
Heat-ray welding Tripods.
This is an incredibly great idea.
Indeed a good idea, but I would only hope it would have a reliable fail-safe, becaue it would be a little reverse GoldenEye.